Optical grade magnifying lens with 4" viewing portal is perfect for aquarium photography with focal range approximately 3 to 8 inches.
Held in place by strong rare earth magnets for use on tanks up to 5/8" (16mm) tank wall thickness
Easily moves around the tank for viewing from any location
Great at checking for any early signs of disease or pests on your reef coral  or fish!
DeepSee is Safe for both glass and acrylic aquariums!